/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.spark.mllib.tree

import org.apache.spark.SparkFunSuite
import org.apache.spark.mllib.tree.impurity.{EntropyAggregator, GiniAggregator}

/**
 * Test suites for [[GiniAggregator]] and [[EntropyAggregator]].
 */
class ImpuritySuite extends SparkFunSuite {
  test("Gini impurity does not support negative labels") {
    val gini = new GiniAggregator(2)
    intercept[IllegalArgumentException] {
      gini.update(Array(0.0, 1.0, 2.0), 0, -1, 0.0)
    }
  }

  test("Entropy does not support negative labels") {
    val entropy = new EntropyAggregator(2)
    intercept[IllegalArgumentException] {
      entropy.update(Array(0.0, 1.0, 2.0), 0, -1, 0.0)
    }
  }
}
